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techtalk:ref:svcproc24 [2020/08/22 21:24] hippysmack |
techtalk:ref:svcproc24 [2024/01/22 21:29] (current) hippysmack |
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====== Measuring Pinion Shaft Runout ====== | ====== Measuring Pinion Shaft Runout ====== | ||
- | + | Check to see if your crank is out of true. The idea is to measure how much the end of the pinion shaft wobbles. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/145445-cam-bushing-wear?t=1578649)) \\ | |
- | Check to see if your crank is out of true. The idea is to measure how much the end of the pinion shaft wobbles. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1578649)) \\ | + | |
Up to .005"-.006" out there at the end of the shaft doesn't propose a huge problem. Most motors you measure will show this much. \\ | Up to .005"-.006" out there at the end of the shaft doesn't propose a huge problem. Most motors you measure will show this much. \\ | ||
But above that is not good. Crank spread is a reality of racing these bikes. The flywheels want to spread apart on the side opposite the crankpin. \\ | But above that is not good. Crank spread is a reality of racing these bikes. The flywheels want to spread apart on the side opposite the crankpin. \\ | ||
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To confirm pinion shaft runout dims, make the measurement as in below. \\ | To confirm pinion shaft runout dims, make the measurement as in below. \\ | ||
- | |Attach a scrap piece of metal to the outside of the gearcase and position a gauge holder on it so it won't move while turning over the engine. ((photos by anachris of the XLFORUM ))||| | + | |Attach a scrap piece of metal to the outside of the gearcase and position a gauge holder on it so it won't move while turning over the engine. ((photos by anachris of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/160037-bottom-end-rebuild#post3404527))||| |
|{{:techtalk:ref:tools:checking_pinion_shaft_runout_1_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_2_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_3_by_anachris.jpg?direct&300|}}| | |{{:techtalk:ref:tools:checking_pinion_shaft_runout_1_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_2_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_3_by_anachris.jpg?direct&300|}}| | ||
- | + | |Install a dial gauge on the holder with the pointer on \\ the pinion shaft. Find the lowest spot while turning \\ the engine over and 'zero' the indicator. ((photo by Grind of the XLFORUM))|This setup is made with a piece of angle iron for the magnetic base to stand on ((photos by dezzertrat of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/173328-77-xlt-teardown-and-rebuild?t=1860581))|| | |
- | |Install a dial gauge on the holder with the pointer on \\ the pinion shaft. Find the lowest spot while turning \\ the engine over and 'zero' the indicator. ((photo by Grind of the XLFORUM))|This setup is made with a piece of angle iron for the magnetic base to stand on ((photos by dezzertrat of the XLFORUM http://xlforum.net/forums/showthread.php?t=1860581))|| | + | |
|{{:techtalk:ref:tools:checking_pinion_shaft_runout_6_by_grind.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_7_by_dezzertrat.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_8_by_dezzertrat.jpg?direct&300|}}| | |{{:techtalk:ref:tools:checking_pinion_shaft_runout_6_by_grind.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_7_by_dezzertrat.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_8_by_dezzertrat.jpg?direct&300|}}| | ||
- | + | |This gauge post is threaded into a cover mount hole. ((photos by DirtyCory of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/127032-getting-this-78-back-to-the-way-it-should-be/page8?t=1297584&page=8))|| | |
- | |This gauge post is threaded into a cover mount hole. ((photos by DirtyCory of the XLFORUM http://xlforum.net/forums/showthread.php?t=1297584&page=8))|| | + | |
|{{:techtalk:ref:tools:checking_pinion_shaft_run-out_1_by_dirtycory.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_run-out_2_by_dirtycory.jpg?direct&300|}}| | |{{:techtalk:ref:tools:checking_pinion_shaft_run-out_1_by_dirtycory.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_run-out_2_by_dirtycory.jpg?direct&300|}}| | ||
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